Biogeography, a scientist is studying the distribution of extinct and modern ferns in North America., Homologous Structures, Whales, bats and birds have the same bone that connects their limbs to the middle of their bodies., Molecular Biology, Humans and chimpanzees share some DNA and protein sequences., Embryological studies, Chicken, pig, and fish embryos all have the pharyngeal folds., Common Ancestor, A predecessor that a creature shares with another creature., Radioactive Dating, Used to determine the age of fossils., Fossils, A preserved piece of excrement or a footprint from 10 thousand years ago. , Vestigial Structures, Humans' appendix and wisdom teeth no longer have a function yet are still present in the body..

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